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Astronomik CLS CCD Light Pollution Filter - 42 mm Round - CLSCCD-42


Astronomik CLS CCD Light Pollution Filter - 42 mm Round

  • Eliminates the resulting orange glare from urban light pollution by permitting the largest section of visible light and H-alpha emissions to pass while obstructing the spectral lines of mercury and sodium-vapor.
  • Displays extra features in nebulae as well as additional stars.
  • In addition to making an excellent filter for imaging, the Astronomik CLS CCD Light Pollution Filter also works well for observing deep sky objects with all aperture telescopes or with f/3 focal ratio and above photo lenses.
  • Presented in a round 42 mm format.
  • The Astronomik CLS CCD Filter allows close to 100% transmission from 450 nm to 530 nm which encompasses the visible light and h-alpha spectral areas.
  • All Astronomik filters contain multi-layer coatings for protection against blemishes from scratching, aging and high humidity.
  • Made in Germany, a country known for producing high quality optics!

More About Astronomik CLS CCD Light Pollution Filters

DSLR Cameras have been remodeled for astronomical use, making them suitable for use with the CLS-CCD Filter in an extremely light-polluted environment. This filter highlights the contrast between the background and your selected object. It also has a wider transmission curve compared to UHC filters, transmitting more light to render stars that are less dimmed. The Astronomik CLS-CCD Filter has been optimized to simultaneously intercept as much spurious light as possible while providing the best performance for approved wavelengths.

The Astronomik CLS-CCD Filter intercepts unwanted mercury and sodium-vapor spectral lines while allowing the desirable visible light and H-alpha emissions to pass. This enables the CLS-CCD Filter to block out most of the encompassing light pollution, doing away with that bothersome orange glare. Great for DSLR, CCD, black & white film photography, and deep sky viewing, this filter works best with lenses of all apertures that have f/3 and above focal ratios.

Alternative uses for the Astronomik CLS-CCD Light Pollution Filter include easier Double Star resolution, and emission line data color imaging in the Luminance channel. As with all Astronomik filters, the CLS-CCD is parfocal with all other filters made by Astronomik. It is highly resistant to scratching, aging, and high humidity, and has a thickness of only 1 mm. This filter is also diffraction limited so you won't experience any drop off in your telescope's optical performance. Like all Astronomik filters, the CLS-CCD comes with a high-quality, long-lasting plastic storage case.

Transmission Specifications:

  • 92% transmission at 486 nm (H-beta)
  • 92% transmission at 496 nm (OIII)
  • 92% transmission at 501 nm (OIII)
  • 97% transmission at 656 nm (H alpha)
  • Pass from 450 to 540 nm and beyond 650 nm